You'll get an easier answer from 'The meaning of Life'!
I never know, and just charge into the GH and tell them I'm going to pinch them, and they all shudder and let me fly around, knocking them all about, and then they even thank me!
Seriously, it has never been proven what to do, and the books are hopeless!
Persoanly, I'd pinch them out and give them a good talking to! They deserve this as they normally die before we ever get them to this stage, so be omnipresent!
(That's a long word, Growster, do you know any more...;0)